Thermometer



(No Model.)

J. T. GRAW.

THERMOMETER. No. 530,928. Patented Dec. 18,1894.

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UNITED 'STATES PATENT OFFICE.

JOSEPH T. GRAW, OF JERSEY CITY, NEW JERSEY, ASSIGNOR OF ONE-HALF TOBROWN & BAILEY, OF PHILADELPHIA, PENNSYLVANIA.

THERMOMETER.

SPECIFICATION forming part of Letters Patent No. 530,928, dated December18, 1894.

Application tiled August 19, 1892. Serial No. 443,517. (No model.)

To @ZZ whom, it may concern.:

Be it known that I, JOSEPH T. GRAW, a citizen of the United States, anda resident of Jersey City, in the county of Hudson and State of NewJersey, have invented certain new and useful Improvements inThermometers and Barometers, of which the following is a specilication.

My invention relates to improvements in thermometers and barometers, andit -is the object of my invention to adapt the same to be readily adjusted for correcting the reading of the instrument by providing for longitudinal movement of the mercury tube.

Referring to the drawings, which accompany the specification, Figure 1is an elevation of the face of theinstrument, in this case athermometer. Fig. 2 is a cross section on the line 2;2 of Fig. l. Fig. 3is a vertical section on the line 8 3 of Fig. 1. Fig. 4 isrdetail,showing how the clamps to hold the tube in any desired position asrespects the scale are easily made.

A, is a thermometer with tube, a, and bulb, a. The blown end, b, is bentout and at about right angles, so as to form a stop, as seen in Fig. 3,to limit the movement of the thermometer in one direction.

B, is the board, or bracket, on which the thermometer is set, and havinga longitudinal groove, c, deep enough to allow the thermometer tube tobe set in flush with the surface of the board.

d, is a slot for the bulb, ct.

`On the face of the board, B, is the ordinary scale of temperatures, e,graduated accurately for the thermometer when the same is in oneposition, and on the board, B, may also be a line, f, a little below thetop of the groove, c, and so positioned that when the extreme end of thetube is in line therewith, the reading will be correct. Iny the saidgroove, c, are glued one or more half tubes ofrubber, g, made bydividing short sections of rubber tubing diametrically, (Fig. 4;) thebore of the rubber tubes being small enough toy tightly clamp the tube,a, of the thermometer, A. Now the said thermometer tube, a, is placed inthe groove, c, and the bulb, a', in the slot, d, and so that both tubeand bulb may have end play of about 10o of the scale, or more or lessif'so desired. Then bands, h, are screwed or riveted across the slot d,over the rubber half tubes, g, aud a cage, k, of the usual kind is xedon the board, B, over the bulb, a. The thermometer is now in place,being clamped by the rubber tubes, g, g, so that it can not move withoutsome. force applied to it.

- rate piece andmade movable, the essential features of my inventionwould be equally well attained.

Now, having described my invention, I declare that what I claim, anddesire to secure by Letters Patent, is

1. The combination of the thermometer or barometer A, the board Bgrooved and slotted longitudinally a greater length than the length ofsaid thermometer. or barometer, clamps of elastic material fixed in thesaid groove and adapted to hold the thermometer or barometer A in theposition to which the same is moved, substantially as described.

2. In combination with a board and scale a thermometer A, stop b, groovec, rubber clamps g, fixed in said groove c and adapted to hold thethermometer A in the position to vwhich said thermometer is moved, anddevices for holding said thermometer on the board, substantially asdescribed.

Signed at New York, in the county of New York and State of New York,this 15th day of August, A. D. 1892. f

JOSEPH T. GRAW. Witnesses:

ARTHUR L. KENT, M. ELIZABETH FINLEY.

